vice president joe biden is set to lead the u.s. delegation to pope francis' inauguration mass which will be held tuesday morning. >> abc's cokie roberts, a long time vatican observer, has been reporting from rome all week. she sat down with "nightline's" terry moran to talk about what we can expect from the new pope. >> so as a world waits to find out more about newt pope, the white house said vice president biden is going to lead the u.s. delegation to pope francis' inauguration mass next tuesday morning. abc's cokie roberts, a vatican observer has been here all week, reporting on this, and joins us now. in a big picture way, what does this mean, what does it say that the church, the cardinals have chosen this man? >> it says they're ready to make a big change. benedict after john paul ii was continuity. this is a huge difference. instead of the cerebral, theologian, you have this down to earth man of the people. and of course he is from the new world. and that is a very big deal for this church. which, really does still kid us in